The application of various picloram formulations to cut stumps of Brachystegia spiciformis Benth., Julbernardia globiflora (Benth.) Troupin, Terminalia sericea Burch. ex DC. and Acacia karroo Hayne trees
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Trees were felled 150 mm above ground level and various mixtures of picloram with 2, 4-D amine, 2, 4, 5-T amine in water solution or 2, 4, 5-T ester in diesel oil were applied to the freshly-cut surfaces. Mixtures of piclo- ram/2, 4-D amine and picloram/2, 4, 5-T amine, both water soluble, gave the highest kill rates when applied to trees in the growing season (October and May). The oil emulsifiable picloram/2, 4, 5-T ester formulation tended to be effective throughout the year and high kill rates were frequently obtained with applications made in June or July. Application rates of picloram/2, 4-D amine or picloram/2, 4, 5-T amine (expressed as g a.e. picloram per mm girth) required to kill 80% of the trees were 0, 012 - 0, 016 for A. karroo; 0, 016-0, 037 for T. sericea and 0, 037 for J. globiflora. Few of the treatments applied to B. spiciformis trees resulted in kill rates of more than 65%. Borne is 150 mm bo grondvlak afgesaag en verskeie mengsels van picloram met 2, 4-D amien, 2, 4, 5-T amien opgelos in water of 2, 4, 5-T ester opgelos in dieselolie, is op die vars gesaagde vlak aangewend. Mengsels van picloram/2, 4-D amien en picloram/2, 4, 5-T amien, wat albei wateroplosbaar is, het die hoogste vernietigings- tempo gelewer indien hulle gedurende die groeiseisoen (Oktober en Mei) aangewend is. Die olie emulsiefiseer- bare picloram/2, 4, 5-T ester formulasie het geneig om gedurende die jaar effektief te wees en hoe vernietigings- tempos is dikwels behaal met behandelings wat in Junie of Julie gedoen is. Toedieningsvlakke van picloram 2, 4-D amien of picloram/2, 4, 5-T amien (as g a.e. picloram per mm omtrek) om 80% van die borne te dood, was 0, 012-0, 016 vir A. karroo; 0, 016-0, 037 vir T. sericea en 0, 037 vir T. globiflora. Min van die behandelings wat op B. spiciformis gedoen is, het vernietigingstempos bo 65% behaal. 1990 Taylor & Francis Group, LLC.
